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D( r )
(3*r)^5 = 0
(3*r)^5 = 0
(3*r)^5 = 0
243*r^5 = 0 // : 243
r^5 = 0
r = 0
r in (-oo:0) U (0:+oo)
(r^4)/((3*r)^5) = 0
1/243*r^-1 = 0 // : 1/243
r^-1 = 0
r należy do O
r belongs to the empty set
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